Re: _e_info in NSException.h

[Richard Frith-Macdonald]

On 13 Jan 2008, at 21:20, Sebastian Reitenbach wrote:

> Hi,
>
> after I got sope and sogo working with gnustep-make 2 and gnustep-base
> 1.14.1, I tried to compile against gnustep-base1.15.2.
>
> sope compilation ended in an error:
> Structure has no member named: _e_info
> there is a line:
> ASSIGN(self->_e_info, _userInfo);
>
> after a bit digging I figured out that it was removed not long ago  
> from
> NSException.h:
>
> http://svn.gna.org/viewcvs/gnustep?rev=25681&view=rev
> after adding again:
> NSDictionary *_e_info;
>
> sope compiled again.
>
> I wonder why was it removed? or is it an error to set it, in the first
> place?

It's an error to try to set it in the first place  ... the leading  
underscore in the name if the instance variable tells you that this  
is a private instance variable intended for internal use only.  In  
1.15.2 it has been replaced by _reserved (which is used only when  
necessary to store additional information .... user info and/or  
stacktrace ... in an exception).
NSException has no external instance variables ... I guess if the  
sope code wants to store extra information in an exception it should  
create a new exception based on the values returned by the methods of  
the original one.